Method of dishing metal plates



' (No Model.) H. O. JONES.

v METHOD OF DISHING M-BTAL PLATES. 7 No; 270,077. Patented Jan. 2, 1883.

N, PETERS Phclc-Lflhogmpher. Washington, D4 C.

UNITED H STATES I PATENT OFFICE.

HENRY O. JONES, OF WILMINGTON, DELADTARE.

METHOD OF DISHING METAL PLATES.

To all whom it may concern Be it known that I, HENRY O.JONES, a citizenof the United States, and a resident of 'Wilmington, Delaware, haveinvented certain Improvements in Dishing Metal Plates, of which thefollowing is a specification,

My invention relates to a mode of forming concavo-convex plates-such asare used for the ends of the cylindrical bodies of steamboilers,woodpulp digesters, and for many other purposes-the said mode consistingin depressing a plate into a concave former by rolling over the saidplate a heavy rounded weight, as described hereinafter.

In the accompanying drawings, Figure 1 is a vertical section of aformer, and side view of the weight by which my invention is carriedinto effect; Fig? 2, a plan view of Fig. 1; and Fig. 3, a modified formof weight.

A is a former consisting of a heavy casting supported on a suitablefoundation, this former having a concave upper surface,-and beingessentially similar to those in use for dishing plates.

, latter, adjoining the said former, is a rest, Gr,

consisting preferably of a substantial casting, for supporting theweight when it is not in use,

January 2, 1883.

a portion of this rest presenting an inclined plane, d, up or down whichthe weight may be rolled. The plate W to be dished is placed on theformer A and the weight B, which had hitherto been retained on the restG, is rolled down the inclined plane dof the said rest onto the plate,and by means of the handles D a numberot' operatives proceed to roll theweight over the plate, the weight and handles being turned laterallyfrom time to time, so that the weight may be applied to all parts of theplate, until the latter conforms with the concave upper surface of theformer A. A plate can thus be dished more rapidly, accurately, and by aless effort than by the usual mode of hammering itinto a concave former.

It is not essential that the weight should be spherical. It may be ofthe form shown in Fig. 3, for instance; but it must always be rounded. y

In dishing wrought-iron plates, they must of course be in a heatedcondition when operated on; but there are plates of softer metal whichcan be dished in the manner described while they are cold.

I claim as my invention-- The mode herein described of dishing metalplates, the said mode consisting in depressing the plate into a concaveformer by rolling a rounded weight in different directions over theplate, substantially vas set fort In testimony whereofI have signed myname to this specification in the presenceof two subscribing witnesses.

. HENRY C. JONES. Witnesses:

- HARRY DRURY, HARRY SMITH.

